Hiro had to learn how to do bigger and better things if he were to be in the chunnin exams and stand a chance of surviving. That was just the fact of the matter. He couldn't be bothered to join and not even win. That would make him lose way too much time. He had to make sure he was ready to be the head of the household when the current one inevitably stepped down. He knew they would because that's how being the head of a clan worked, especially one of the Nara's stature.
That's what made him organize a meeting with one of the genin of the Hyuga household. it was to gain a connection that and make the great clans of Konoha friendly with each other. That was the important part but that wasn't the entire reason. He had to see what the Hyuga were going to bring to the exams.
He, however, was sitting on the floor meditating to increase his chakra reserves.
1/5 chakra training